Traci,
My wife and I have taken various airlines to Aruba from Buffalo over the past 17 years and have found that Jetblue was the most accomodating. We have flown Delta and US Air through Philly and Pitts and Delta once through Atlanta, which I wouldn't reccomend, but still say Jetblue through JFK has been the best for us. Always in Jan / Feb and only one hiccup but nothing to do with weather. Last year and this year on return we are going through Boston only to get an earlier arrival time. We always book way in advance and fly on Tuesdays or Wednesdays. Hope this helps